{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["concept or principle", "machine or equipment", "material", "engineering feature", "process parameter", "application"], "input": "However , it is difficult to converge to the optimal solution , especially when multiple objectives are set ."}
{"concept or principle": ["solution"], "machine or equipment": [], "material": [], "engineering feature": [], "process parameter": [], "application": ["set"]}